<!-- eslint-disable vue/no-template-shadow -->
<template>
  <div style="margin-top: 16px">
    <el-form-item :label="$t('messageInstance')">
      <div style="display: flex; align-items: center; justify-content: space-between; flex-wrap: nowrap">
        <el-select v-model="bindMessageId" @change="updateTaskMessage">
          <el-option v-for="id in Object.keys(messageMap)" :value="id" :label="messageMap[id]" :key="id" />
        </el-select>
        <el-button size="mini" type="primary" icon="el-icon-plus" style="margin-left: 8px" @click="openMessageModel" />
      </div>
    </el-form-item>
    <el-dialog
      :visible.sync="messageModelVisible"
      :close-on-click-modal="false"
      :title="$t('createNewMessage')"
      width="400px"
      append-to-body
      destroy-on-close>
      <el-form :model="newMessageForm" size="mini" label-width="auto" @submit.native.prevent>
        <el-form-item :label="$t('messageId')">
          <el-input v-model="newMessageForm.id" clearable />
        </el-form-item>
        <el-form-item :label="$t('messageName')">
          <el-input v-model="newMessageForm.name" clearable />
        </el-form-item>
      </el-form>
      <template slot="footer">
        <el-button size="mini" type="primary" @click="createNewMessage">{{ $t('sure') }}</el-button>
      </template>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'ReceiveTask',
  props: {
    // eslint-disable-next-line vue/require-default-prop
    id: String,
    // eslint-disable-next-line vue/require-default-prop
    type: String
  },
  data () {
    return {
      bindMessageId: '',
      newMessageForm: {},
      messageMap: {},
      messageModelVisible: false
    }
  },
  watch: {
    id: {
      immediate: true,
      handler () {
        this.$nextTick(() => this.getBindMessage())
      }
    }
  },
  created () {
    this.bpmnMessageRefsMap = Object.create(null)
    this.bpmnRootElements = window.bpmnInstances.modeler.getDefinitions().rootElements
    this.bpmnRootElements
      .filter(el => el.$type === 'bpmn:Message')
      .forEach(m => {
        this.bpmnMessageRefsMap[m.id] = m
        this.$set(this.messageMap, m.id, m.name)
      })
    this.$set(this.messageMap, '-1', '无') // 添加一个空对象，保证可以取消原消息绑定
  },
  methods: {
    getBindMessage () {
      this.bpmnElement = window.bpmnInstances.bpmnElement
      let bindMessageId = '-1'
      if (this.bpmnElement && this.bpmnElement.businessObject && this.bpmnElement.businessObject.messageRef) {
        bindMessageId = this.bpmnElement.businessObject.messageRef.id
      }
      this.bindMessageId = bindMessageId
    },
    openMessageModel () {
      this.messageModelVisible = true
      this.newMessageForm = {}
    },
    createNewMessage () {
      if (this.messageMap[this.newMessageForm.id]) {
        this.$message.error('该消息已存在，请修改id后重新保存')
        return
      }
      const newMessage = window.bpmnInstances.moddle.create('bpmn:Message', this.newMessageForm)
      this.bpmnRootElements.push(newMessage)
      this.$set(this.messageMap, this.newMessageForm.id, this.newMessageForm.name)
      this.bpmnMessageRefsMap[this.newMessageForm.id] = newMessage
      this.messageModelVisible = false
    },
    updateTaskMessage (messageId) {
      if (messageId === '-1') {
        window.bpmnInstances.modeling.updateProperties(this.bpmnElement, {
          messageRef: null
        })
      } else {
        window.bpmnInstances.modeling.updateProperties(this.bpmnElement, {
          messageRef: this.bpmnMessageRefsMap[messageId]
        })
      }
    }
  },
  beforeDestroy () {
    this.bpmnElement = null
  }
}
</script>
